This file is indexed.

/etc/poldi/localdb/users is in libpam-poldi 0.4.1-3+b1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This is the database used by Poldis "local database" authentication
# method.  Syntax of this file is:
# 
#   This file consists of entries - one entry per line.
#   Entries are of the form: "<SERIALNO><WHITESPACES><USERNAME>\n"
#   (without quotation marks and without angle brackets.  Allowed
#   whitespaces are spaces and tabs.  <SERIALNO> is the serial number
#   of an OpenPGP smartcard as reported by poldi-ctrl
#   --print-serialno.  <USERNAME> is a valid username on the system.
#   Comments are opened with "#" and terminated by a newline.
#
# So, a valid entry would look like:
#   "D2760001240101010001000006550000	moritz"